Does the following scenario violate conservation of momentum: air particles are in a room, then they fall and settle down on the floor.

[So each air particle starts with 0 speed then they fall and settle flatly (0 speed). I say it doesn't violate it, but it does violate cons. of energy (unless there's a trade-off like temperature change). But, strictly to the question, it doesn't violate cons. of momentum] thoughts?
Pic unrelated, but nice.